modelClosedVolume
Volume of fixed size, closed to the ambient, with inlet/outlet ports
Extends from Modelica.Fluid.Vessels.BaseClasses.PartialLumpedVessel (Lumped volume with a vector of fluid ports and replaceable heat transfer model).
Information
Ideally mixed volume of constant size with two fluid ports and one medium model.
The flow properties are computed from the upstream quantities, pressures are equal in both nodes and the medium model if use_portsData=false.
Heat transfer through a thermal port is possible, it equals zero if the port remains unconnected.
A spherical shape is assumed for the heat transfer area, with V=4/3*pi*r^3, A=4*pi*r^2.
Ideal heat transfer is assumed per default; the thermal port temperature is equal to the medium temperature.
If use_portsData=true, the port pressures represent the pressures just after the outlet (or just before the inlet) in the attached pipe.
The hydraulic resistances portsData.zeta_in and portsData.zeta_out determine the dissipative pressure drop between volume and port depending on
the direction of mass flow. See VesselPortsData and [Idelchik, Handbook of Hydraulic Resistance, 2004].
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| SI.ReynoldsNumber | Re_turbulent (from PartialLumpedVessel) | 100 | cf. suddenExpansion |
| SI.Volume | V | Volume | |
| Assumptions › Dynamics | |||
| Types.Dynamics | energyDynamics (from PartialLumpedVolume) | system.energyDynamics | Formulation of energy balance |
| Types.Dynamics | massDynamics (from PartialLumpedVolume) | system.massDynamics | Formulation of mass balance |
| Types.Dynamics | substanceDynamics (from PartialLumpedVolume) | massDynamics | Formulation of substance balance |
| Types.Dynamics | traceDynamics (from PartialLumpedVolume) | massDynamics | Formulation of trace substance balance |
| Initialization | |||
| Medium.AbsolutePressure | p_start (from PartialLumpedVolume) | system.p_start | Start value of pressure |
| Boolean | use_T_start (from PartialLumpedVolume) | true | = true, use T_start, otherwise h_start |
| Medium.Temperature | T_start (from PartialLumpedVolume) | if use_T_start then system.T_start else Medium.temperature_phX(p_start, h_start, X_start) | Start value of temperature |
| Medium.SpecificEnthalpy | h_start (from PartialLumpedVolume) | if use_T_start then Medium.specificEnthalpy_pTX(p_start, T_start, X_start) else Medium.h_default | Start value of specific enthalpy |
| Medium.MassFraction[Medium.nX] | X_start (from PartialLumpedVolume) | Medium.X_default | Start value of mass fractions m_i/m |
| Medium.ExtraProperty[Medium.nC] | C_start (from PartialLumpedVolume) | Medium.C_default | Start value of trace substances |
| General › Ports | |||
| Integer | nPorts (from PartialLumpedVessel) | 0 | Number of ports |
| Boolean | use_portsData (from PartialLumpedVessel) | true | = false to neglect pressure loss and kinetic energy |
| Modelica.Fluid.Vessels.BaseClasses.VesselPortsData | portsData (from PartialLumpedVessel) | Data of inlet/outlet ports | |
| Advanced › Port properties | |||
| Medium.MassFlowRate | m_flow_nominal (from PartialLumpedVessel) | if system.use_eps_Re then system.m_flow_nominal else 1e2*system.m_flow_small | Nominal value for mass flow rates in ports |
| SI.MassFlowRate | m_flow_small (from PartialLumpedVessel) | if system.use_eps_Re then system.eps_m_flow*m_flow_nominal else system.m_flow_small | Regularization range at zero mass flow rate |
| Boolean | use_Re (from PartialLumpedVessel) | system.use_eps_Re | = true, if turbulent region is defined by Re, otherwise by m_flow_small |
| Assumptions › Heat transfer | |||
| Boolean | use_HeatTransfer (from PartialLumpedVessel) | false | = true to use the HeatTransfer model |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| VesselFluidPorts_b[nPorts] | ports (from PartialLumpedVessel) | Fluid inlets and outlets | |
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | heatPort (from PartialLumpedVessel) |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Fluid.System | system (from PartialLumpedVolume) | System properties | |
| SI.Volume | fluidVolume (from PartialLumpedVolume) | Volume | |
| Medium.BaseProperties | medium (from PartialLumpedVolume) | ||
| SI.Energy | U (from PartialLumpedVolume) | Internal energy of fluid | |
| SI.Mass | m (from PartialLumpedVolume) | Mass of fluid | |
| SI.Mass | mXi (from PartialLumpedVolume) | Masses of independent components in the fluid | |
| SI.Mass | mC (from PartialLumpedVolume) | Masses of trace substances in the fluid | |
| Medium.ExtraProperty[Medium.nC] | C (from PartialLumpedVolume) | Trace substance mixture content | |
| SI.MassFlowRate | mb_flow (from PartialLumpedVolume) | Mass flows across boundaries | |
| SI.MassFlowRate | mbXi_flow (from PartialLumpedVolume) | Substance mass flows across boundaries | |
| Medium.ExtraPropertyFlowRate | mbC_flow (from PartialLumpedVolume) | Trace substance mass flows across boundaries | |
| SI.EnthalpyFlowRate | Hb_flow (from PartialLumpedVolume) | Enthalpy flow across boundaries or energy source/sink | |
| SI.HeatFlowRate | Qb_flow (from PartialLumpedVolume) | Heat flow across boundaries or energy source/sink | |
| SI.Power | Wb_flow (from PartialLumpedVolume) | Work flow across boundaries or source term | |
| Medium.EnthalpyFlowRate[nPorts] | ports_H_flow (from PartialLumpedVessel) | ||
| Medium.MassFlowRate[nPorts,Medium.nXi] | ports_mXi_flow (from PartialLumpedVessel) | ||
| Medium.MassFlowRate | sum_ports_mXi_flow (from PartialLumpedVessel) | Substance mass flows through ports | |
| Medium.ExtraPropertyFlowRate[nPorts,Medium.nC] | ports_mC_flow (from PartialLumpedVessel) | ||
| Medium.ExtraPropertyFlowRate | sum_ports_mC_flow (from PartialLumpedVessel) | Trace substance mass flows through ports | |
| HeatTransfer | heatTransfer (from PartialLumpedVessel) | ||
| Medium.Density | portInDensities (from PartialLumpedVessel) | Densities of the fluid at the device boundary | |
| SI.Velocity | portVelocities (from PartialLumpedVessel) | Velocities of fluid flow at device boundary | |
| SI.EnergyFlowRate | ports_E_flow (from PartialLumpedVessel) | Flow of kinetic and potential energy at device boundary | |
| Real | s (from PartialLumpedVessel) | Curve parameters for port flows vs. port pressures; for further details see, Modelica Tutorial: Ideal switching devices | |
| Real | ports_penetration (from PartialLumpedVessel) | Penetration of port with fluid, depending on fluid level and port diameter | |
| SI.Area | portAreas (from PartialLumpedVessel) | {Modelica.Constants.pi/4*portsData_diameter[i]^2 for i in 1:nPorts} | |
| Medium.AbsolutePressure | vessel_ps_static (from PartialLumpedVessel) | Static pressures inside the vessel at the height of the corresponding ports, zero flow velocity | |
| SI.MassFlowRate | m_flow_turbulent (from PartialLumpedVessel) |